A static route is a pre-determined path that network information must follow to reach a specific host or network.

Here are two typical scenarios, as examples of when a static route is needed, consider the following case.

Scenario 1:

Issue: The gateway of PC is router2 which connected the Internet, but when PC visit servers in intranet, firstly the request will be sent to router2. Because there is no route to server1 and server2 on route table of router2, thus the request will be thrown away.

Resolution:Therefore, if you want PC to visit servers in intranet, you have to set up a static route on router2 helps your packet route to router1.